Drill bit Proline 77801 — 1 piece

Proline 77801 drill bit, single piece included. Designed for drilling clean, precise holes in metal, steel sheets and plastics, this HSS drill bit with titanium nitride coating offers improved wear resistance and sustained cutting performance. The roller shank provides secure grip in the drill chuck while the self-centring tip prevents wandering on rounded or slippery surfaces, ensuring accurate starts on oval or curved workpieces.

Advantages

The 4241 high-speed steel construction combined with a titanium nitride coating increases heat resistance and reduces friction, extending tool life. The design promotes rapid heat dissipation when working with harder materials, while the cutting geometry leaves hole edges clean and burr-free. The roller shank improves retention in the chuck and reduces slippage, and the self-centring point allows immediate, stable engagement on curved or polished surfaces.

Suitable for

• Drilling holes in metal and steel sheets
• Working with plastics and composite materials
• General construction and workshop tasks
• Woodworking and DIY repairs where metal or plastic fastenings are required

Key specifications

• Material: 4241 high-speed steel (HSS)
• Coating: titanium nitride (TiN)
• Shank type: roller shank for improved chuck grip
• Tip: self-centring geometry for rounded and slippery surfaces
• Application: metal, steel sheets, plastics
• Result: clean, burr-free hole edges and rapid heat dissipation

How to use

Install the drill bit securely in a compatible drill chuck designed to accept roller shanks. Select an appropriate rotation speed for the material being drilled — lower speeds for harder metals and higher speeds for plastics — and apply steady, even pressure without forcing the bit. Use cutting fluid or coolant when drilling thicker or harder metal sheets to improve heat control and tool life. Retract the bit periodically to clear chips when drilling deeper holes.

Usage recommendations

For best results, clamp workpieces firmly and mark drilling points clearly. Use appropriate personal protective equipment such as safety glasses and gloves. When drilling thin metal sheets, consider backing the material with sacrificial support to reduce distortion and achieve cleaner hole edges.